Príncipe

• 1. Introduction

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  Príncipe was uninhabited when Portuguese sailors reached it on the 17th of January 1471, and they named it Ilha de Santo Antão, after Saint Anthony. King John II of Portugal later renamed the island Príncipe, meaning Prince's Island, in honor of his son Afonso. Afonso was the hereditary prince of Portugal, and he lived from 1475 to 1491.

  Off the west coast of Africa, in the Gulf of Guinea, this island forms the smaller, northern half of a country. That country is now called São Tomé and Príncipe. What was it about this small landmass that later drew astronomers chasing a total solar eclipse? And how did centuries of colonial rule reshape its land and its people?

• 2. Shaped By Fire

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  Príncipe covers just 142 square kilometers, including its offshore islets. It is a heavily eroded volcano, part of a chain of volcanic islands known as the Cameroon Line. In the south, the island rises to 947 metres at its highest point, Pico do Príncipe. Smaller islands surround it, among them Ilhéu Bom Bom, Ilhéu Caroço, Tinhosa Grande and Tinhosa Pequena. On the 29th of April 1995, Príncipe became the Autonomous Region of Príncipe, a status matching the boundaries of the existing Pagué District. Today the island has one airport, coded PCP by IATA and FPPR by ICAO, along with smaller settlements such as Sundy and Porto Real. None of that geography explains why, in 1919, Albert Einstein's theory needed this particular patch of sky.

• 3. A Test Of Gravity

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  On the 29th of May 1919, a total solar eclipse crossed the sky above Príncipe. The British astronomer Arthur Stanley Eddington had brought a team to observe it. Eddington had traveled here specifically to test a prediction from Albert Einstein's new theory of relativity. Einstein's theory suggested that gravity from a massive body, like the sun, could bend the path of light passing near it. During the brief darkness of totality, Eddington's team photographed the stars near the eclipsed sun. Those photographs showed the starlight had shifted position exactly as Einstein predicted. The observations became known afterward as the Eddington experiment, one of the earliest experimental confirmations of general relativity. The same small island had already spent centuries building a very different story, one involving forced labor and a shifting cash crop.

• 4. Cane, Cocoa And Chains

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  Santo António, the island's first settlement, was founded in 1502. Portuguese colonists soon turned the north and center of the island into plantations, relying on slave labor to run them. Sugar was the first crop grown there, but after 1822 planters switched to cocoa. Príncipe eventually became the world's greatest producer of cocoa. Since the country's independence, most of those plantations have grown back into forest. A fortress called Fortaleza de Santo António da Ponta da Mina guarded the settlement, built in 1695 on a point inside Santo António Bay. In 1706, French forces destroyed both the fortress and the town. Santo António later served as the colonial capital of Portuguese São Tomé and Príncipe, a role it held from 1753 to 1852. Centuries later, census records would show exactly how that plantation economy had reshaped who lived on the island, starting with a count taken in 1771.

• 5. Counting The People

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  In 1771, Príncipe counted 5,850 people: 111 white residents, 165 free mulattoes, 6 enslaved mulattoes, 900 free black residents, and 4,668 enslaved black residents. By 1875, the year slavery was officially abolished across the archipelago, that number had collapsed to just 1,946 people. Of those, 45 were Europeans, 1,521 were free natives, and 380 were freemen. The population then grew again over the following century. At the 2012 census, Príncipe had 7,324 residents, and by an official estimate in May 2018, that figure had risen to 8,420. Portuguese is the island's official and main language. Alongside it, residents also speak Portuguese-based creoles, chiefly Principense, also called Lunguyê, and to some extent Forro. Those censuses never counted Príncipe's other inhabitants: birds, frogs and geckos found nowhere else in the world.

• 6. A Living Reserve

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  In 2006, Príncipe gained a protected area, the Parque Natural Obô do Príncipe, covering the mountainous, densely forested and uninhabited southern part of the island. Endemic birds fill that forest, among them the Principe scops owl, the Príncipe kingfisher, the Príncipe seedeater and the Principe starling. Also present are the Príncipe sunbird, Dohrn's thrush-babbler and the Príncipe weaver. The Príncipe white-eye also lives here, though it is shared with the neighboring island of São Tomé. Reptiles and amphibians add to the list: the Príncipe gecko, the palm forest tree frog and the Príncipe puddle frog. Even the surrounding waters hold unique life, including a mollusc called Muricopsis principensis and the West African mud turtle. In 2012, UNESCO designated Príncipe as a Biosphere Reserve under its Man and the Biosphere Programme. The reserve covers the whole island, plus its islets: Bom Bom, Boné do Jóquei, Mosteiros, Santana and Pedra da Galei, along with the Tinhosas. That reserve expanded in 2025 to include São Tomé as well. The move made São Tomé and Príncipe the first country designated as a biosphere reserve in its entirety. Príncipe's list of notable residents runs from politicians to writers, a singer and a footballer, each carrying a piece of the island's story forward.

• 7. Notable Figures

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  Damião Vaz d'Almeida once served as prime minister of São Tomé and Príncipe. João Paulo Cassandra served as the island's autonomous president in 2005-2006, and José Cassandra held the same office in 2006-2020. Sara Pinto Coelho was a Portuguese writer born on the island during the colonial period. Camilo Domingos, a singer, and Manuela Margarido, a writer, also trace their roots to Príncipe. Nuno Espírito Santo, an association football goalkeeper, went on to work as a manager in the sport. His path from goalkeeper to manager shows how far a career that started on this small island can travel.